JPH0521822Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a multipolar electromagnetic relay for switching the operation of, for example, a DC motor or a DC polarized solenoid between forward and reverse directions.

(Prior art) Generally, automobile wipers etc. have two control circuits.
By providing two electromagnetic relays, one for forward rotation and the other for reverse rotation, and driving these alternately, the DC motor or the like is rotated in forward and reverse directions for reciprocating operation.

(Problem to be solved by the invention) However, the two electromagnetic relays are independent, and generally each electromagnetic relay has one
Since it has 5 common terminals, 2 coil terminals, and 2 fixed contact terminals, a total of 5 terminals, a total of 10 terminals are required to connect these two electromagnetic relays to a printed circuit board, etc. In addition, the wiring work is troublesome, and the pattern of the printed circuit board becomes complicated, which increases the time and effort required for its design.

In addition, when installing two independent electromagnetic relays, it is necessary not only to maintain the mutual insulation distance to a safe value, but also to ensure the insulation distance from each other electrical equipment and components, so the size of each relay must be twice as large. Compared to those with electromagnetic relays installed, they required more board space and had the problem of being an obstacle to constructing high-density circuits.

(Means for solving the problem) The present invention was made to solve the above problem, and consists of an electromagnet with a coil wound around an iron core, and both ends having magnetic poles bent into a substantially U-shape. two yokes attached to both ends of the iron core so that different poles face each other on the sides of the electromagnet; a magnet is sandwiched between two iron pieces; two movable blocks each having a rotatable portion facing the magnetic pole; movable contacts at both ends; a common terminal approximately in the center; Based on the above, two movable contact springs are provided to rotate around the common terminal, and two movable contact springs each have a fixed contact at both ends, and each of the fixed contacts faces the movable contacts of the different movable contact springs. An electromagnetic relay is constructed of a fixed terminal member and.

(Example) The present invention will be described below with reference to the accompanying drawings showing an example.

Figure 1 shows an electromagnetic relay according to the present invention, and this electromagnetic relay roughly consists of two relay units.
The relay unit Ra has a movable block 5 and a movable contact spring 7, and the other relay unit Rb has a movable block 6 and a movable contact spring 8. Rb is the electromagnet 2, yokes 3, 4, and fixed terminal members 9, 1
0 is shared.

The electromagnet 2 has a coil 22 wound around an iron core 21. Both ends of the iron core 21 are fitted into fixing holes 31, 41 (31 not shown) formed in the yokes 3, 4, and attached to the base 1. It is fixed.

Note that both ends of the coil 22 are electrically connected to coil terminals 23 and 24 attached to the base 1 with both ends protruding.

In addition, the yokes 3 and 4 are formed by bending both ends of the plate material into a substantially U-shape to form opposing magnetic pole pieces 31, 32, 41, and 4.
2, the tips of the magnetic pole pieces 31 and 32 are opposed to the tips of the magnetic pole pieces 42 and 41, respectively, and the opposing magnetic pole pieces 31 and 41 are S poles, and the magnetic pole pieces 32 and 42 are N poles. It is slightly magnetized.

The movable blocks 5 and 6 have a pair of iron pieces 5 facing each other.
1, 52, 61, 62, permanent magnets 53, 53,
63, 63 and the bearing member 5 located between them
4 and 64, and the cards 5 are placed on both ends of the iron pieces 51 and 61 located on the outside.
7, 58, 67, and 68 are attached.

The movable blocks 5, 6 are disposed on both sides of the electromagnet 2, and are mounted on the base 1 with iron pieces 51, 52, 61, 62 located on both sides of the magnetic pole pieces 31, 42, 32, 41, respectively. supporting shafts 56, 66
are inserted into the bearing holes 55, 65 of the bearing members 54, 64, and are rotatably supported.

In addition, the permanent magnets 53 and 63 held between the iron pieces 51, 52, 61, and 62 have the iron pieces 51 and 62 side N
The poles and iron pieces 52 and 61 sides are magnetized to S poles.

The movable contact springs 7 and 8 are movable contact pieces 71 and 81
Common terminals 74, 84 are provided by extending downwardly approximately the center portion of
The movable contact piece 7 is a substantially T-shaped plate with a
Movable contacts 72, 73, 8 are provided at both ends of 1, 81.
2 and 83, and the common terminals 74 and 84 are attached to the outer sides of the movable blocks 5 and 6, respectively, with the common terminals 74 and 84 protruding from the lower surface of the base 1.

The fixed terminal members 9 and 10 have base parts 91 and 1, respectively.
A fixed terminal 96 is provided by extending the substantially central portion of 01 downward.
106 (96 is not shown in FIG. 1), and bent pieces 92, 93, 102, 103 are formed by bending both ends of the base parts 91, 101, and fixed contacts 94, 95, 104,
105 is fixedly installed. The fixed terminal members 9, 10 are disposed on the outer sides of the yokes 3, 4, respectively, and are attached to the base 1 with terminals 96, 106 projecting downward, and the fixed contacts 94, 95, 1
04, 105 is the movable contact 7 of the movable contact spring 7, 8
2, 83, 73, and 82, respectively.

Next, the operation of the electromagnetic relay having the above configuration will be described with reference to the case where the electromagnetic relay is used to drive a DC motor in forward and reverse rotation.

In FIGS. 2 to 4, both ends of the DC motor M are connected to the common terminals 74 and 84, respectively, the fixed terminals 96 and 106 are connected to the + and - terminals of the operating power source, respectively, and the coil terminals 23 and 24 are connected to the + and - terminals of the operating power source, respectively. They are connected to switches SW1 and SW2, respectively, and by turning on either switch SW1 or SW2, a current can be applied to the coil 22 in either the forward or reverse direction.

In addition, each terminal 23, 24, 74, 84, 96,
106 are each connected to a circuit pattern formed on a printed circuit board using solder or the like.

Then, in the non-energized state, that is, the switch SW
1. In the state shown in FIG. 2 in which SW2 is turned off and no current is applied to the coil 22, the iron piece 51 is connected to the magnetic pole piece 31 in the relay unit Ra.
The iron piece 52 is attracted to the magnetic pole piece 42, the movable block 5 rotates in the direction of arrow a around the support shaft 55, and the movable contact piece 71 is pushed by the card 58 and the movable contact 7
2 contacts the fixed contact 94, and the movable contact 7 on the opposite side
3 and the fixed contact 105 are spaced apart from each other.

In relay unit Rb, iron piece 61 is connected to magnetic pole piece 3.
2, the iron piece 62 is attracted to the magnetic pole piece 41, the movable block 6 rotates in the direction of arrow b around the support shaft 66, the movable contact piece 81 is pushed by the card 68, and the movable contact 83 contacts the fixed contact 95. The movable contact 8 and the fixed contact 104 are in contact with each other and are separated from each other.

That is, the contacts 94 and 95 of the fixed terminal member 9 function as normally closed fixed contacts, and the fixed contacts 104 and 105 of the fixed terminal member 10 function as normally open fixed contacts.

In this state, as shown in Figure 2, both poles of the motor M will be connected to the + terminal of the power supply, but there is no problem because this state can be avoided by exciting the electromagnet 2. .

Next, as shown in FIG. 3, switch SW1 is turned on while switch SW2 is turned off, a current is applied to the coil 22 in the direction of the arrow, and the yoke 3 is
When the pole and yoke 4 are excited to the N pole, the magnetic pole pieces 31 and 42 of the relay unit Ra maintain the same polarity as in the non-energized state, so the movable block 5 maintains the non-energized state (see Fig. 2). .

On the other hand, magnetic pole pieces 32 and 41 of relay unit Rb
In this case, the magnetic poles with opposite magnetic properties to those in the non-excited state are excited, and the magnetic force generated by this is applied to the magnetic pole pieces 32, 4.
The movable block 6 rotates in the direction of arrow b', the movable contact piece 81 is pushed by the card 67, the movable contact 83 is separated from the fixed contact 95, and the movable block 6 rotates in the direction of arrow b'. Movable contact 82 contacts fixed contact 104 .

As a result, as shown in FIG. 3, the common terminal 7
4 is electrically connected to the + terminal of the power source via the movable contact piece 71 and the fixed terminal 96, while the common terminal 84 is electrically connected to the - terminal of the power source via the movable contact piece 81 and the fixed terminal 106. A current in the direction of arrow P is applied to drive the motor in the forward direction.

Conversely, as shown in Figure 4, switch SW2 is turned on while switch SW1 is turned off to turn on coil 2.
2, the direction of the current applied to yoke 3 is switched.
When the magnetic pole piece 3 is excited to the N pole and the yoke 4 to the S pole, the magnetic pole piece 3
1 and 42 are excited with magnetism opposite to the non-excited state, the movable block 5 rotates in the direction of arrow a', and the movable contact piece 71 is pushed by the card 57 and the movable contact 7
2 is separated from the fixed contact 94, and the movable contact 73 on the opposite side contacts the fixed contact 105.

On the other hand, magnetic pole pieces 32 and 41 of relay unit Rb
Since the movable block 6 is excited with the same polarity as the non-excited state, the movable block 6 returns to the non-excited state (see FIG. 2).

As a result, the common terminal 74 is connected to the movable contact piece 71,
The other common terminal 84 is electrically connected to the - terminal of the power supply via the fixed terminal 106 and the movable contact piece 81.
The motor M is electrically connected to the fixed terminal 96 through the terminal 96, and a current in the direction of the arrow Q is applied to the motor M, thereby driving the motor M in the reverse direction.

In the above embodiment, the case where the electromagnetic relay according to the present invention is used to control the drive of the DC motor M is shown, but the present invention is not limited to this, and it can also be applied to a case where the DC polarized solenoid is operated in the forward direction or the reverse direction. Of course, it is also possible to use

Further, in the embodiment, the terminal 2 of the electromagnetic relay
3, 24, 74, 84, 96, and 106 are connected to the circuit pattern of the printed circuit board with solder, etc., but the terminal shape is not limited to this, and the terminal shape is a socket insertion terminal, and the terminal is inserted into the socket to connect to the electrical connection. It may also be possible to connect the

(Effects of the invention) As is clear from the above explanation, the electromagnetic relay according to the invention rotates a DC motor, etc. in the normal direction by switching and cutting off the direction of the current applied to the coil of one electromagnet. , reversing, and stopping, it is more economical than a similar operation using two electromagnetic relays, and when installed on a board, etc., it requires only an insulating distance from other electrical equipment. It is only necessary to take this into account, which improves space efficiency and allows a higher density circuit to be constructed.

Further, unlike conventional electromagnetic relays, two fixed contacts are provided on the fixed terminal member, without providing fixed terminals corresponding to the fixed contacts. Therefore, when two electromagnetic relays are used, at least 10 terminals must be connected to the board, etc., but according to the present invention, a common terminal,
2 fixed terminals and 2 coil terminals, that is 6
All you have to do is connect the terminals on the book, making circuit design and wiring easier.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electromagnetic relay according to the present invention;
2 to 4 are circuit diagrams showing how a DC motor is operated using the electromagnetic relay of the present invention. DESCRIPTION OF SYMBOLS 1... Base, 2... Electromagnet, 3, 4... Yoke, 5, 6... Movable block, 7, 8... Movable contact spring, 9, 10... Fixed terminal member, 21... Iron core, 22... ... Coil, 23, 24 ... Coil terminal, 31, 32, 41, 42 ... Magnetic pole piece, 51,
52, 61, 62... Iron piece, 53, 63... Permanent magnet, 56, 66... Support shaft, 57, 58, 67,
68... Card, 71, 81... Movable contact piece, 7
2, 73, 82, 83...Movable contact, 74, 84
...Common terminal, 93, 94, 103, 104...
Fixed contact, 96, 106...Fixed terminal.

Claims (1)

[Scope of utility model registration request] An electromagnet with a coil wound around an iron core, and two ends having magnetic poles bent to form a substantially U-shape, and attached to both ends of the iron core so that different poles face each other at the sides of the electromagnet. A yoke, two movable blocks in which a magnet is held between two iron pieces, and both ends of the iron pieces are rotatably provided on both sides of the electromagnet so as to face the magnetic poles, and movable contacts at both ends.
It has a common terminal approximately in the center, and two movable contact springs are provided on the sides of the movable block so as to rotate around the common terminal based on the operation of the movable block, and are fixed at both ends, respectively. An electromagnetic relay comprising two fixed terminal members each having a contact and each of the fixed contacts facing the movable contacts of the different movable contact springs.